Last updated: 19 Dec 2024
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What is the AUFLS Project | Background information | Workshops |
Timelime | Industry involvement | |
What is Automated Under-Frequency Load Shedding Project?
AUFLS is the acronym for Automatic Under-Frequency Load Shedding and describes the set of relays in New Zealand which automatically trip blocks of load, following a severe under-frequency event, to restore the system frequency.
Transpower as System Operator relies on the AUFLS scheme to prevent system collapse following under-frequency events which have the potential to cause a system black-out.
Under previous Code arrangements, North Island AUFLS providers, and Transpower as grid owner in the South Island, must arm two blocks of load for AUFLS provision. The total load armed in each block must be at least 16% of the provider’s total network demand. Each provider must provide information that either complies with the technical codes or is reasonably requested by the System Operator, to assist in the System Operator planning to comply and complying with its principal performance obligations. North Island AUFLS providers have been required to provide this data annually, via submitting their Distributor Asset Capability Statement spreadsheets. In addition to the System Operator providing regular reporting, following an Extended Contingent Event, the System Operator will complete analysis of the performance of the AUFLS scheme and request that North Island AUFLS providers provide specific AUFLS data.
Background information – Development of the North Island AUFLS four block scheme proposal
Between 2010 and 2013, the Electricity Authority (Authority) reviewed the AUFLS arrangements and identified that the scheme could be amended to improve overall performance. The Authority has been working with the System Operator to develop a proposal for these amendments – moving from a two-block to a four-block AUFLS scheme.
Details of the decision to implement a four-block AUFLS scheme can be found on the Authority’s website.
Project Timeline
The AUFLS Project is delivered in 4 phases.
The first phase of the project was completed early 2022. Phase 4 commenced in January 2024. The project is expected to be completed by end June 2025.
Ongoing Industry Involvement / Contact Us
The System Operator will actively engage with the North Island AUFLS providers over the duration of the project. This will be through industry workshops, one-on-one direct engagement and through provision of supporting material.
You can send your queries regarding the AUFLS Project to [email protected].
Transition Quarterly Industry Presentations
- December 2024 Presentation
Topics Supporting Documents - Celebrate reaching the 2/3 of transitions
- AUFLS transition dashboard
Lessons learnt
Spotlight topics
Question and Feedback
Presentation - September 2024 Presentation
Topics Supporting Documents - Celebrate reaching halfway point
- AUFLS transition dashboard
Lessons learnt
Testing requirements - HVDC Flow Studied: Before and Actual
Question and Feedback
Presentation - June 2024 Presentation
Topics Supporting Documents - High level recap on the AUFLS transition process
- AUFLS transition dashboard
Lessons learnt
BAU requirements linked to the transition
High level overview of studies and results - Question and Feedback
Presentation - March 2024 Presentation
Topics Supporting Documents - High level recap on the AUFLS transition process
- EA Report
- AUFLS transition Dashboard
- Lesson Learnt
- BAU requirements linked to the transition
- BAU: Annual load data submission
- Question and Feedback
Presentation
Industry Workshops
2023
- Workshop 8-9 November 2023
Transition Plan Industry Workshop
The following material is a combination of what was presented at the Transition Plan Workshop and answers to questions that were raised at the workshops:
Topics Supporting Documents - Electricity Authority Update
System Operator Updates
Transition Plan Summary Recap
Transition (Change) Process detailed
What’s next
- Electricity Authority Update
- Workshop 12-13 July 2023
Transition Plan Industry Workshop
The following material is a combination of what was presented at the Transition Plan Workshop and answers to questions that were raised at the workshops:
Topics Supporting Documents - Transition timeframes
- Submissions and main observations
- Study approach and assumptions
- Study results and findings
- Transition plan
- What’s next?
2022
- Workshop 16-17 Nov 2022
Planning for Transition Workshop
The following material is a combination of what was presented at the AUFLS Transition Workshop and answers to questions that were raised at the workshops:
Topics Supporting Documents - Electricity Authority update
- Transition timeframes
- Transition planning
- Assessment approach
- What we need from you
2021
- Workshop 15-16 Nov 2021
AUFLS Data Portal Roll-out Training Workshop
The following material is a combination of what was presented at the AUFLS Training Workshop and answers to questions that were raised at the workshops:
Topics Supporting Documents - AUFLS Customer Portal Roll-Out Update
- Authority Extended Reserves (AUFLS) Code Consultation Update
- System Operator ATR Document Consultation Update
- AUFLS Customer Portal – Data Requirements Refresh
- AUFLS Customer Portal – Load Profile Data Upload Run-Through
- Ongoing Engagement
- Workshop 20-21 Sep 2021
AUFLS Data Portal Roll-out Training Workshop
The following material is a combination of what was presented at the AUFLS Training Workshop on 20-21 Sep and answers to questions that were raised at the workshops:
Topics Supporting Documents - Authority Extended Reserves (AUFLS) Code Consultation Update
- System Operator ATR Document Consultation Update
- AUFLS Customer Portal Roll-Out Timeframes
- AUFLS Customer Portal – Data Requirements Refresh
- AUFLS Customer Portal – Feeder Config Data Run-Through
- Ongoing Engagement
- Workshop 12 & 15 Jul 2021
UFLS Data Portal Roll-out Training Workshop
The following material is a combination of what was presented at the AUFLS Training Workshop and answers to questions that were raised at the workshops:
Topics Supporting Documents - Workshop Objectives
- AUFLS Project Background and Overview
- AUFLS Data Portal and Benefits
- AUFLS Data Portal Roll-Out and what is involved
- AUFLS Data Portal Demonstration and Walkthrough
- Ongoing Engagement
Related information / Documentation
For more background information on the AUFLS scheme, the AUFLS Operations Customer Portal, learning animations, FAQs, and user guides, see the AUFLS web page.